2 bar map calibration

I am running the two bar rtt speed density os on my 99 gmc sierra turbocharged. I notice when I change the map 0 volt calibration number it really affects the afr during open loop (warm up) idle in park. I came up with a figure on my own but the afr was sooooo far off during open loop idle in park my engine was running terrible. I need to know how to tell where to set this number to. I also can not figure out how to change the actual afr when idleing in park. my commanded is not matching my actual. Is this done throught the ve table. or some where else. What needs to be tuned first the ve table or the idle tables.